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Hi! I am sorry to read that you are having some issues with the Xfinity box and your TV. To turn off the UHD resolution please press and hold the rewind and up buttons for more than 10 seconds on your fire remote control. It should change between Auto, 1080p and 2160p (select 1080p). If this does not help, please contact us so we can continue assisting you. Viri E. Insignia Support https://www.insigniaproducts.com/contact-us
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